<html>

<head>
    <title>CSS基础</title>
    <style>
        * {
            margin: 0px;
            padding: 0px;
        }

        ul {
            list-style-type: none;
            border-width: 5px 5px 5px 5px;
            border-style: solid;
            border-color: red;
        }

        li {}
    </style>
</head>

<body>
    <ul>
        <li>文本内容</li>
        <li>文本内容</li>
    </ul>
</body>

</html>